If the ratio of radio of two Circles is 2.5, the ratio of their Circumferences in
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r1/r2= 2/5…………..(1)
C1/C2= 2.π.r1/2.π.r2
C1/C2=r1/r2
C1/C2 = 2/5. or. 2. : 5. Answer.
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